As I stated above, it can be a tough decision when you can't see a clear advantage.
I would not be worried about "the list" - it only makes sense that the local FD would want to know where dry hydrants were located so they could reach the closest one(s) to fill up when there's a fire. They're only going to use it to try and save someone's property - if it were mine, I'd want them to be able to.
In deciding on a dry hydrant, perhaps it could be useful to ask yourself what kind of person you are wrt risk mitigation. Do you wear seatbelts? Signal for turns? (If yes, you probably don't live in Ohio) Pay more for insurance than the law requires? If you do most of those (and I do not mean to disparage you if you don't), you would probably feel better if you spend a few hundred to a thousand and put in a dry hydrant.
Just my $.02